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EP1226025B1 - Rouleau a onduler a absorption des vibrations - Google Patents

Rouleau a onduler a absorption des vibrations Download PDF

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Publication number
EP1226025B1
EP1226025B1 EP00975985A EP00975985A EP1226025B1 EP 1226025 B1 EP1226025 B1 EP 1226025B1 EP 00975985 A EP00975985 A EP 00975985A EP 00975985 A EP00975985 A EP 00975985A EP 1226025 B1 EP1226025 B1 EP 1226025B1
Authority
EP
European Patent Office
Prior art keywords
roll
jacket
corrugator
interposed
core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00975985A
Other languages
German (de)
English (en)
Other versions
EP1226025A1 (fr
Inventor
Giuliano Rossi
Giancarlo Scenini
Raffaele Giove
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Quantum Corrugated SRL
Original Assignee
Agnati SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Agnati SpA filed Critical Agnati SpA
Publication of EP1226025A1 publication Critical patent/EP1226025A1/fr
Application granted granted Critical
Publication of EP1226025B1 publication Critical patent/EP1226025B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/20—Corrugating; Corrugating combined with laminating to other layers
    • B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
    • B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
    • B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
    • B31F1/2845—Details, e.g. provisions for drying, moistening, pressing
    • B31F1/2863—Corrugating cylinders; Supporting or positioning means therefor; Drives therefor

Definitions

  • the invention relates to a damping corrugator roll comprising a cylindrical core and a relatively thin coaxial tubular cylindrical jacket having an outer toothed surface and rotatably supported in a floatable manner on the cylindrical core by an interposed bearing material which fills a hollow space provided between the cylindrical core and the cylindrical jacket.
  • the invention particularly relates to a corrugator roll of the above type, provided in combination with an upper corrugator roll, parallel and tangent to said lower roll, both rolls being part of a corrugator unit for paper sheets, in corrugated board fabrication.
  • the upper corrugator roll has a greater diameter and is rotatably driven, but it also has peripheral skirt teeth, whereby it meshes with the teeth of the lower corrugator roll, which runs idle and is rotatably dragged along by the upper corrugator roll.
  • Vibrations may depend on flexures transverse to the axis of rotation, or on torsional flexures, i.e. in the circumferential direction with respect to the axis of the roll. Vibrations also depend of the shape of the corrugator teeth of the two rolls which, in combination with the paper feed, cause the vibratory motion of the roll. Due to the considerable axial lengths of rolls, the vibratory and/or oscillatory effects are particularly felt in the center part of the roll, i.e. far from the support constraints at the ends thereof. Also, in this center part, the vibratory and/or oscillatory effects are relatively out of control and dependent on the features of the processed paper.
  • Prior art damping means can absorb or damp at least part of the vibrations at the end constraints of the lower corrugator roll, but definitely cannot handle neither systematic nor casual oscillations or vibrations (the latter due to modified features of the paper being processed) at the center part of the corrugator roll. Therefore, a relatively poor damping effect is always obtained, whereby to date a still high level of noise is generated by corrugator units, such that it requires expensive and complex acoustical treatments on machines.
  • vibrations and/or oscillations cause functional problems, such as the need to limit the production rate because the poor vibration dampening causes a loss of attachment between the layers of the corrugated board and a smaller flute width.
  • a vibration-damped paper or cardboard processing roll of the kind described at the beginning and according to the pre-characterizing part of claim 1 is known from the document US-A-5 081 759.
  • the hollow space between a rotating roll-shell and a stationary central axis is filled with a fluid which only transfers a supporting hydraulic force from the stationary central axis to the shell but obviously does not provide a friction coupling between the axis and the shell.
  • the document GB-A-1 036 922 discloses a vibration-damped paper processing roll with a heavy rotatable core and a light shell slightly movable in relation to the core, the space between the core and the shell being filled with an elastically deformable bearing material, particularly with longitudinal rubber or metal tubes placed close together and filled with compressed air for providing a friction coupling between the cylindrical core and the cylindrical shell.
  • the corrugator roll according to the invention is characterized in that
  • the interposed or bearing fluids may be provided under pressure, at atmospheric pressure, or in conditions of negative pressure with respect to external atmospheric pressure. This depends on the conditions of use.
  • the jacket and the cylindrical core form, e.g. by using rotary sealing heads, a sealed hollow space wherein the interposed material is introduced and replaced from time to time after a predetermined number of operating hours.
  • the sealed hollow space formed by the tubular cylindrical jacket and by the cylindrical core may have inlets and outlets for automatic feeding of or filling up with the interposed material, in this case fluid, or for generating a continuous or batch circulation of said fluid, which can provide balanced dynamic conditions in the hollow space as regards pressure and quantity of fluid.
  • the circulation of fluid ensures a constant renewal thereof, for instance with respect to the maintenance of a predetermined temperature or of a predetermined mixture composition or condition, or of any other parameter that can be affected by the use and restored by service treatments.
  • the sealing means at the heads of the tubular toothed cylindrical jacket are such that they allow, by using yielding members, the jacket to be moved at least transverse to the core.
  • the cylindrical jacket has lower weight and inertia values as compared with the central core.
  • the length to diameter ratio of the lower roll i.e. of the jacket of the lower roll is higher than 10.
  • the jacket shall be relatively thin, but anyway have a sufficient thickness to allow paper processing.
  • the diameter to thickness ratio is of 8/1 to 15/1, preferably of about 10/1.
  • the thickness of the jacket may range from 10 to 100 mm, particularly from 20 to 50 mm, preferably from 25 to 35 mm.
  • the hollow space or chamber, or the difference between the outside diameter of the core and the inside diameter of the jacket is of 0,1 to 5 mm, also depending on the diameter and length of the jacket as well as on the type of interposed material.
  • the outer jacket can be made of any suitable material, also composite or in two, three or more layers.
  • the material to be used can be steel or other metals, preferably after undergoing hardening treatments, such as quenching or coating with hard layers, e.g. made of tungsten carbide, hard chromium or titanium nitrides.
  • the invention is based on the acknowledgement that, during operation, the vibrations in the floating jacket cause variations in the bearing thickness (thickness of the hollow space between the floating jacket and the cylindrical core), hence in the bearing fluid.
  • Bearing thickness deformations cause variations in the relative speed of the filling or bearing material, hence variations in the friction coefficient, which have the effect of damping the motions and stresses that generate vibratory motions.
  • the arrangement according to the invention leads to unexpected advantages in combination with bthe toothed corrugator rolls .
  • An effectively damping lower corrugator roll is the most appetizing and required thing in the field.
  • a drastic reduction of the noise generated by vibrations would allow to reduce economic and construction efforts for acoustical treatments.
  • the floating suspension of the lower corrugator roll does not require to account for the specificity of shapes or profiles of the corrugator teeth, since such floating suspension allows a wide adaptability to the teeth shapes, as regards both noise generation and functional effectiveness of the corrugator unit. More particularly it has to be noted that the teeth of corrugator rolls cooperating with each other are not designed to lead to a homocinetic kind of motion.
  • a cradle made of a series of several wheels or belts.
  • Particular advantages results in a corrugator unit of the above mentioned kind in which one of the at least two corrugator rolls has a smaller diameter than the other roll.
  • the damping effectiveness obtained by the roll according to the invention also allows to improve the functionality of the corrugator unit, e.g. with reference to the possibility of increasing the corrugated board production rate, without incurring in manufacturing defects, such as gluing defects and/or variations in flute width.
  • the invention also relates to further improvements, which form the subject of the dependent claims.
  • a corrugator unit comprises a pair of peripherally toothed meshed corrugator rolls 1 and 2.
  • One corrugator roll, the upper one 1, has a relatively great diameter and is rotatably supported and driven at its ends.
  • the second corrugator roll, the lower one 2 has a considerably smaller diameter and is supported in a pressure cradle, composed of belts, pairs of rollers, or else.
  • the lower corrugator roll 2 is pushed with a predetermined force against the upper corrugator roll 1.
  • Figs. 1 and 2 are very schematic views of the construction principle of the lower corrugator roll according to the present invention.
  • This roll consists of a cylindrical core 102, which has rotary support extensions 202 at its ends, whereby the cylindrical core 102 is mounted for free rotation onto the support frame, for instance of the corrugator unit.
  • the cylindrical core 102 is held inside a cylindrical jacket 302, whose inside diameter is greater than the outside diameter of the cylindrical core, thereby forming a cylindrical hollow space 402 between said two parts.
  • the hollow space cannot be closed at the end sides.
  • the jacket 302 has partial or complete heads 502 through which the extensions 202 for support of the cylindrical core 102 extend, then these heads shall be elastically coupled to the core supporting extensions 202, i.e. so that the tubular cylindrical jacket 402 can move transverse to the cylindrical core, at least within the limits of the order of magnitude of the vibrations to be damped. This is shown by the elements denoted with numeral 602.
  • the hollow space 402 can simply contain air at atmospheric pressure, or at different over- or underpressures, or mixtures of gases, liquid fluids or mixtures of liquid fluids, having different, preferably high viscosity values, or highly viscous, or pasty materials, such as fat, or the like.
  • Liquid fluids may include water, oil, mixtures of water and oil, plastic polymers in liquid form, and any type of liquid having the physical characteristics fit for the purpose.
  • the space 402 can be filled with a solid plastic material of the elastic type, particularly having a highly hysteretic elasticity.
  • the fluid materials held in the hollow space 402 preferably have such characteristics as to generate friction coupling between the jacket 302 and the core 102, the friction coefficient being such that it increases as the rotation speed difference between the core and the jacket increases.
  • the tubular jacket 302 rotates freely around the core, substantially floating on an intermediate bearing layer.
  • the jacket is rotatably driven by the upper corrugator roll 1 against which it is pushed, for instance by the belts 8.
  • the core is also rotatably dragged along by the jacket, by being coupled thereto through the fluid or solid bearing substance.
  • the rotation of the core is necessary for the storage of a sufficient inertia, which would not be possessed by the jacket alone. Inertia is required to ensure that the motion conditions of the jacket are as independent as possible from small variables of the product or operating conditions.
  • the fluid or other mass provides the translation of the jacket vibrations into local variations of width of the hollow space and hence into local variations of speed or local gradients of speed, which locally generate an increase of friction, hence the absorption of the energy caused by vibrations, whereupon the latter are at least partially damped.
  • the cylindrical core 102 is generally made of solid steel.
  • the jacket may be made of steel or of any other metal, preferably after undergoing surface hardening treatments, such as quenching or coating with layers of a hard material, e.g. tungsten carbide, hard chromium, etc. and/or titanium nitrides.
  • a hard material e.g. tungsten carbide, hard chromium, etc. and/or titanium nitrides.
  • the thickness of the jacket varies with its diameter, the latter being subject to restrictions based on the length. Generally, with length to diameter ratios higher than 10, the diameter to thickness ratio of the jacket is of 8:1 to 15:1, particularly of 10:1. For usual roll lengths, thickness may range from 10 to 100 mm, particularly from 20 to 50, especially from 25 to 35 mm.
  • the hollow space must not be excessively thick. It can have a thickness of 0.1 to 5 mm.
  • the cylindrical core 1, with the extensions 202 thereof, is slipped into a jacket element 302, which has an inner layer 3 made of a highly hysteretic elastic plastic material. Said material is preshaped to hold the heads 4 for rotatably sealing the jacket, while allowing transverse staggering movements.
  • the layer 3 at the heads of the jacket 302 may have a recess for housing the sealing heads 4, which are properly positioned and locked therein with the desired sealing effect.
  • These heads have no support function on the jacket 302 but are only used to contain substances, fluids or liquids held in the hollow space.
  • the inner plastic layer 3 can have the function of directly damping vibrations.
  • a hollow space may be provided which is filled with air or another fluid, particularly with a viscous liquid.
  • the elastic or viscous vibration absorption behavior may be calibrated by combining two or more layers for bearing the jacket 302.
  • the layer 3 may also be made of metal while the hollow space alone may be filled with the bearing fluid.
  • the heads 4 may have in this case inlets and/or outlets 104 for the bearing and/or interposed fluid. These can be simply used for occasionally filling and/or topping up the hollow space 402 with the bearing fluid.
  • the fluid may be made to permanently circulate between a storage tank and the hollow space, thereby allowing adjustment of the physical and/or composition parameters of the fluid, e.g. by adjusting temperature when the roll is in use.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Paper (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Pulleys (AREA)
  • Vibration Prevention Devices (AREA)

Claims (21)

  1. Cylindre à onduler à effet amortisseur, comportant un mandrin cylindrique (102) et une enveloppe cylindrique tubulaire coaxiale relativement mince (302) ayant une surface dentée extérieure et supportée de manière rotative et flottable sur le mandrin cylindrique (102) par un matériau antifriction intercalé (3) qui remplit un espace creux (402) agencé entre le mandrin cylindrique (102) et l'enveloppe cylindrique (302),
       caractérisé en ce que
    a) le mandrin cylindrique (102) est supporté de manière rotative au niveau de ses extrémités (202),
    b) le matériau antifriction intercalé est un matériau fluide liquide ayant une valeur de viscosité élevée ou un matériau solide ayant un comportement élastique très hystérétique,
    c) le coefficient de frottement du matériau antifriction intercalé par rapport à la peau extérieure du mandrin cylindrique (102) et par rapport à la jupe intérieure de l'enveloppe cylindrique (302) augmente lorsque la vitesse relative entre l'enveloppe (302) et le mandrin (102) augmente.
  2. Cylindre selon la revendication 1, caractérisé en ce que le matériau antifriction ou intercalé est constitué d'un liquide ou a, par exemple, la forme d'une pâte, ou est un matériau solide.
  3. Cylindre selon une ou plusieurs des revendications précédentes, caractérisé en ce que les fluides intercalés ou antifriction peuvent être délivrés, à pression atmosphérique, sous pression ou dans des conditions de pression négative par rapport à une pression atmosphérique extérieure.
  4. Cylindre selon une ou plusieurs des revendications précédentes, caractérisé en ce que l'on peut prévoir que l'enveloppe (302) et le mandrin cylindrique (102) forment, par exemple en utilisant des têtes d'étanchéité rotatives (4), un espace creux étanche (402) dans lequel le matériau intercalé est introduit et peut être remplacé après un nombre prédéterminé d'heures de fonctionnement.
  5. Cylindre selon une ou plusieurs des revendications précédentes, caractérisé en ce que, en variante, l'espace creux étanche (402) formé par l'enveloppe cylindrique tubulaire (202) et par le mandrin cylindrique (302) peut comporter des entrées et des sorties (105) pour réaliser une alimentation automatique en matériau intercalé ou un remplissage à l'aide de celui-ci, dans ce cas un fluide, ou pour générer une circulation continue ou fractionnée dudit fluide, laquelle circulation est commandée de sorte qu'elle peut générer des conditions dynamiques équilibrées dans l'espace creux (402) en ce qui concerne la pression et la quantité de fluide.
  6. Cylindre selon une ou plusieurs des revendications précédentes, caractérisé en ce que, de manière combinée, il comporte des moyens pour assurer une circulation du fluide antifriction ou intercalé et des moyens pour assurer un renouvellement constant ou fractionné et/ou un conditionnement dudit fluide, par exemple en ce qui concerne le maintien à une température prédéterminée ou à une composition ou un état prédéterminé des composants fluides.
  7. Cylindre selon une ou plusieurs des revendications précédentes, caractérisé en ce que les moyens (5) pour rendre étanches les têtes de l'enveloppe cylindrique dentée tubulaire (302) sont telles qu'elles permettent, en utilisant des éléments élastiques (602), de déplacer l'enveloppe (302) au moins de manière transversale par rapport au mandrin (102).
  8. Cylindre selon une ou plusieurs des revendications précédentes, caractérisé en ce que l'enveloppe cylindrique (302) a des valeurs de poids et/ou d'inertie inférieures par rapport au mandrin central (102).
  9. Cylindre selon une ou plusieurs des revendications précédentes, caractérisé en ce qu'en fonction de la longueur, le rapport entre la longueur et le diamètre du cylindre inférieur (2), c'est-à-dire de l'enveloppe (302) du cylindre inférieur (2) est supérieur à 10.
  10. Cylindre selon une ou plusieurs des revendications précédentes, caractérisé en ce que l'enveloppe (302) est relativement mince, mais a de toute façon une épaisseur suffisante pour permettre une transformation du papier.
  11. Cylindre selon une ou plusieurs des revendications précédentes, caractérisé en ce que le rapport entre le diamètre du cylindre (2) et l'épaisseur de l'enveloppe (302) est compris entre 8/1 et 15/1, de préférence égal à environ 10/1.
  12. Cylindre selon une ou plusieurs des revendications précédentes, caractérisé en ce que l'espace creux ou la chambre (402), ou la différence entre le diamètre extérieur (1) du mandrin et le diamètre intérieur de l'enveloppe va de 0,1 jusqu'à 5 mm, également en fonction du diamètre et de la longueur de l'enveloppe ainsi que du type de matériau intercalé.
  13. Cylindre selon une ou plusieurs des revendications précédentes, caractérisé en ce qu'il peut être constitué d'un matériau adapté quelconque, même composite ou composé d'une, deux, trois couches ou plus.
  14. Cylindre selon la revendication 13, caractérisé en que le matériau à utiliser peut être un acier ou d'autres métaux, ayant de préférence subi des traitements de durcissement, tels qu'une trempe ou une enduction de couches dures, par exemple constituées de carbure de tungstène, de chrome dur ou de nitrures de titane.
  15. Cylindre selon une ou plusieurs des revendications précédentes, caractérisé en ce que l'espace creux (402) peut être rempli à l'aide d'une, deux, trois couches ou plus de matériau intercalé ou antifriction, qui forment un remplissage combiné.
  16. Cylindre selon une ou plusieurs des revendications précédentes, caractérisé en ce que l'enveloppe (302) et le matériau pour remplir l'espace creux (402) sont à couche double, triple ou multiple.
  17. Cylindre selon une ou plusieurs des revendications précédentes, caractérisé en ce qu'il est agencé en combinaison avec un autre cylindre à onduler (1), auquel il est tangent, alors que ledit autre cylindre (1) s'engrène par l'intermédiaire de ses dents périphériques avec les dents périphériques du cylindre (2), lesdits deux cylindres (1, 2) constituant une partie d'une unité à onduler pour fabriquer un carton ondulé.
  18. Cylindre selon la revendication 1 et selon une ou plusieurs des revendications précédentes 2 à 17, caractérisé en ce qu'il ne comporte aucune denture extérieure et/ou qu'il ne constitue pas une partie de l'unité à onduler.
  19. Cylindre à onduler à effet amortisseur selon une ou plusieurs des revendications précédentes, caractérisé en ce qu'il est agencé en combinaison avec une unité à onduler, particulièrement pour des feuilles ou des bandes de papier, ou similaire, du type comportant au moins deux cylindres ayant une surface dentée ou ondulée et étant mutuellement en prise et poussés l'un contre l'autre par une pression ou une force prédéterminée, la compression mutuelle entre les cylindres étant exercée sur la totalité de la longueur axiale des cylindres par l'intermédiaire de moyens mécaniques ou magnétiques, et dans laquelle l'un des cylindres ondulés est un cylindre à onduler selon une ou plusieurs des revendications 1 à 18.
  20. Cylindre à onduler selon la revendication 19 caractérisé en ce qu'il est supporté par un berceau constitué d'une série de plusieurs roues ou courroies, les roues ou les courroies étant agencées en combinaison avec des moyens pour réguler la force exercée sur le cylindre à onduler contre le cylindre à onduler coopérant.
  21. Cylindre à onduler selon la revendication 19 ou 20, caractérisé en ce qu'il a un diamètre plus petit que l'autre cylindre à onduler avec lequel il coopère.
EP00975985A 1999-11-05 2000-11-02 Rouleau a onduler a absorption des vibrations Expired - Lifetime EP1226025B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITSV990036 1999-11-05
IT1999SV000036A IT1309926B1 (it) 1999-11-05 1999-11-05 Cilindro ondulatore smorzante.
PCT/EP2000/010795 WO2001032410A1 (fr) 1999-11-05 2000-11-02 Rouleau a onduler a absorption des vibrations

Publications (2)

Publication Number Publication Date
EP1226025A1 EP1226025A1 (fr) 2002-07-31
EP1226025B1 true EP1226025B1 (fr) 2004-09-15

Family

ID=11408364

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00975985A Expired - Lifetime EP1226025B1 (fr) 1999-11-05 2000-11-02 Rouleau a onduler a absorption des vibrations

Country Status (7)

Country Link
EP (1) EP1226025B1 (fr)
AT (1) ATE276099T1 (fr)
AU (1) AU1391001A (fr)
DE (1) DE60013877T2 (fr)
ES (1) ES2223609T3 (fr)
IT (1) IT1309926B1 (fr)
WO (1) WO2001032410A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6623416B2 (en) * 1999-06-18 2003-09-23 Marquip, Llc Single facer with resilient small diameter corrugating roll
DE10358292B3 (de) † 2003-12-12 2005-01-13 Shw Casting Technologies Gmbh Schwingungsgedämpfte Walze

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1354656A (fr) * 1962-05-30 1964-03-06 Karlstad Mekaniska Ab Calandre à papier
DE3527398A1 (de) * 1985-07-31 1987-02-12 Kuesters Eduard Walze
DE3638070A1 (de) * 1986-11-07 1988-05-19 Voith Gmbh J M Walze
DE3642090C1 (de) 1986-12-10 1988-07-14 Peters W Maschf Einseitige Wellpappenmaschine
DE4318035C2 (de) * 1993-05-29 1997-02-20 Voith Gmbh J M Walze mit Schwingungsdämpfer
IT1298011B1 (it) * 1997-07-11 1999-12-20 Agnati Spa Gruppo ondulare, in particolare per fogli o nastri di materiale cartaceo, o simili.

Also Published As

Publication number Publication date
ITSV990036A1 (it) 2001-05-05
DE60013877T2 (de) 2005-09-29
ATE276099T1 (de) 2004-10-15
AU1391001A (en) 2001-05-14
EP1226025A1 (fr) 2002-07-31
DE60013877D1 (de) 2004-10-21
WO2001032410A1 (fr) 2001-05-10
IT1309926B1 (it) 2002-02-05
ES2223609T3 (es) 2005-03-01

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